The helium leaks aren’t the problem, right now. It is the thrusters.
When the thrusters are fired, they detect combustion by measuring pressure in the combustion chamber or nozzle. Within just a few milliseconds they expect to see pressure come up in the chamber.
If the pressure does not come up within a certain time-frame, they shut down the thruster.
These thruster use hypergolic fuels, meaning they ignite on contact. For smooth operation, the valves need to open precisely at the right time so that one liquid does not accumulate before the other arrives. If you have valve issues or fuel supply issues, BOOM.
They had several pressure sensors fail, giving incorrect readings. The thruster would not fire, or remain firing for more than a few milliseconds. There are some concerns about over temperatures effecting the pressure sensors. They ought to be concerned.
It is my understanding that they can override the pressure sensor data. But that comes with more risks. What if the sensors are correct?
They are running ground tests right now to gain a better understanding of the effects of heat on the pressure sensors.
What? You are actually stating facts, logic, and reality into this thread instead of imaginary blather? No fun. /s